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getv accepts a default value
The `getv` template function does not accept a default value. The
workaround is to write templates like this:
{{if exists "/example/app/option"}}
option = {{getv "/example/app/option"}}{{else}}default_value{{end}}
Resolve the issue by accepting an optional default value. Templates
can now be written like this:
value: {{getv "/key" "default_value"}}
This change is backwards compatible with the current `getv` function.
If the key is missing and a default value is given the missing key error
will be suppressed and the default value will be returned.
If the key is missing and no default value is given the `getv` function
will return an error and template processing will halt.
Fixes kelseyhightower#219
Merge pull request kelseyhightower#394 from HeavyHorst/master update some docs
Capture and return errors during watches on consul Before this change consul errors were not returned correctly during watches. Resolved the issue by returning the initial watch index and error and avoid the nil pointer dereference. Fixes kelseyhightower#322
Merge pull request kelseyhightower#174 from cinience/patch-1 Update templates.md
Merge pull request kelseyhightower#160 from kelseyhightower/add-exist… …-function template: add exists function
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